What Your IP Address Actually Reveals About You
TL;DR: Your public IP tells a website your approximate city, your ISP, and which autonomous system owns the network — but not your name, street address, or identity. It becomes identifying only when combined with cookies, logins, or a legal request to your ISP. See yours with What's My IP.
📋 Contents
The short answer
Every time you load a web page, the server sees your public IP address. There is no way around this — IP is how packets get routed back to you. What changes is which IP the server sees (yours, your VPN's, or your carrier's NAT gateway) and how much extra context the server can attach to it.
The honest list of what a raw IP reveals, without any other data, is surprisingly short:
- A rough geographic location — usually the correct country, often the correct metro area, rarely better than that.
- Your ISP or hosting provider (via the ASN that owns the IP range).
- Whether the IP is residential, mobile, data centre, or Tor exit (via commercial IP-intelligence databases).
- Sometimes a reverse-DNS hostname that hints at region or carrier.
It does not reveal your name, exact address, what device you use, or what you did last Tuesday. Those come from other signals — cookies, logins, and browser fingerprints — combined with the IP, not from the IP itself.
Geolocation: how close does it get?
IP geolocation works by mapping IP ranges to known physical locations. Commercial providers (MaxMind, IP2Location, IPinfo) build their databases from a mix of sources: registry data (RIPE, ARIN, APNIC), ISP-published location hints, wifi-assisted cross-references, and user reports. Accuracy varies enormously:
- Country: ~99.5% accurate for most providers.
- Metro area: 70–85% for fixed-line home broadband.
- Postal code: 30–60%, often placing you at the ISP's central office, not your home.
- Exact coordinates: effectively random — never trust them.
When a site shows you "We think you are in [wrong city 40 km away]" — that's because the ISP assigned your modem an IP from a pool registered to a different central office. It's not a bug, it's how IP allocation works.
🧭 Try it on yourself
Our What's My IP tool shows the geolocation our CDN assigns to your IP. Compare it to where you actually are — the gap is often instructive.
Check your IPYour ISP and your ASN
Every IP belongs to an Autonomous System — a block of addresses managed by a single
network operator. The ASN is a stable, publicly advertised number (like AS7922 for Comcast,
AS3320 for Deutsche Telekom, AS55836 for Reliance Jio). It's visible to any server
that does a lookup.
What an ASN reveals:
- Which company owns your traffic. A site can tell if you're a Comcast residential user, a
Vodafone mobile user, an AWS EC2 instance, or a known VPN like NordVPN (ASN
AS136787). - Whether you look like a human or a bot. Traffic from
AS16509(Amazon) orAS14061(DigitalOcean) is heavily scrutinised — it's almost certainly a scraper, a bot, or a self-hosted VPN. - Whether you're probably a VPN customer. Commercial IP-intelligence feeds tag ASNs that belong to known VPN providers. Streaming services use these feeds to block Netflix-circumvention attempts.
You cannot hide your ASN from a site you're connecting to — it's determined by the IP you're using. You can only change which ASN the site sees by changing which IP you connect from (using a VPN, a proxy, or Tor).
Reverse DNS: the hidden label on your IP
Every IP can have a PTR record — a reverse-DNS hostname set by the network operator. For residential connections these are usually auto-generated and look like:
c-73-168-42-11.hsd1.ma.comcast.net
dsl-berlin-mitte-243.t-online.de
host-92-3-12-8.range92-3.btcentralplus.comNotice what leaks: hsd1.ma.comcast.net → Comcast high-speed-data, Massachusetts. A field in
the reverse DNS of a residential cable modem told a server the state. For some European carriers the
hostname encodes the city or the exchange (dsl-berlin-mitte). Not every ISP does this, but when
they do it's more accurate than geolocation and comes at zero cost to a server.
Reverse DNS is also used by anti-abuse systems to tell apart data-centre IPs (which usually have generic
ec2-52-91-23-4.compute-1.amazonaws.com patterns) from residential ones, and to detect when a
residential IP is actually a TOR exit, a VPN, or a known proxy pool.
IPv6 is a different story
An IPv6 address is 128 bits: the first 64 (the prefix) belong to your ISP, the last 64 (the interface identifier) belong to your device. That second half is where privacy gets complicated.
The old way (EUI-64): derive the interface ID from the network card's MAC address. This embedded a unique per-device identifier in every connection you made, for years. Even roaming to a different network didn't change the lower 64 bits — same device, same half of the IP, everywhere.
The modern way (RFC 4941 / 8981 privacy extensions): generate a random interface ID and rotate it every few hours. All modern OSes (Windows 10+, macOS 10.7+, recent Linux, iOS, Android) enable this by default.
Two things still leak:
- The /64 prefix is stable and geographically precise. Your ISP assigns a prefix to your home router; everyone in your home shares it. That prefix often maps to a much smaller area than an IPv4 allocation.
- Self-hosted services frequently don't use privacy extensions. A home NAS, a custom-compiled Linux box, or an old IoT device may still advertise the MAC-derived form.
⚠️ VPN + IPv6 = leak risk
Many consumer VPN clients tunnel IPv4 only and leave IPv6 on the native interface. If a site prefers IPv6 (most major ones do), your "hidden" traffic goes over the unprotected path. Check your VPN's IPv6 policy, or disable IPv6 at the OS level when using a VPN that doesn't handle it.
Mobile networks and CGNAT
On mobile data and some budget home ISPs, your device doesn't get its own public IPv4. Instead the carrier runs Carrier-Grade NAT (CGNAT): hundreds or thousands of users share a single public IPv4, and the NAT box translates ports. When a website sees your IP, it sees the CGNAT gateway, which may cover a whole city or region.
For privacy this cuts both ways. You're harder to identify individually (the IP is shared with many others), but services that IP-block for abuse often punish the whole pool — which is why you sometimes get a CAPTCHA for no reason on mobile data, or get flagged as a bot.
Four common myths
Myth 1: "Someone with my IP can find my house."
False for random third parties. An IP resolves to an ISP, not a street address. The ISP has the street address but only discloses it under a court order. The best anyone without that order can do is the city-level estimate.
Myth 2: "My IP is unique and permanent."
Residential IPv4 addresses rotate — sometimes daily, sometimes every time you restart your router. CGNAT-shared IPs change constantly. Stable "permanent" IPs are usually business lines or self-hosted VPS.
Myth 3: "A VPN makes me anonymous."
A VPN changes the IP a site sees. It doesn't anonymise your logins, your cookies, your browser fingerprint, or your WebRTC packets unless it's configured to block non-tunneled UDP. See our WebRTC leak guide.
Myth 4: "Incognito mode hides my IP."
Incognito only stops the browser from writing history, cookies, and cache to disk. It does not touch the network stack. Your IP is visible to every site you visit exactly the same way it always is.
What a VPN changes (and what it doesn't)
A VPN routes your traffic through a server you trust (more than you trust your ISP). The site you're visiting sees the VPN's IP and ASN, not yours. That's real protection — but the protection has a narrow scope.
What a VPN hides:
- Your ISP's ASN and the geolocation of your home IP, for traffic that goes through the tunnel.
- The traffic's content from your ISP (it sees only encrypted packets to the VPN endpoint).
What a VPN does not hide:
- Your identity if you log in to an account. A VPN doesn't magic away your Gmail address.
- Your browser fingerprint — canvas, fonts, client hints, timezone. Sites that stitch sessions by fingerprint don't care what IP you're on.
- WebRTC-leaked real IP unless the VPN blocks non-tunneled UDP.
- DNS queries unless the VPN has its own resolver and forces traffic through it.
- IPv6 traffic unless the VPN tunnels IPv6 too.
✅ Verify before you trust
Connect to your VPN, then run What's My IP and WebRTC Leak Test side by side. If both show the VPN's IP, you're covered. If WebRTC shows your real IP while the IP page shows the VPN, you have a leak.
What to do about it
- ✅ Know what your IP looks like publicly — run What's My IP now and compare the geolocation to where you actually are.
- ✅ If you use a VPN, verify both IPv4 and IPv6 are tunneled. Disable IPv6 at the OS level if the VPN doesn't handle it.
- ✅ Test for WebRTC leaks after any browser or VPN update — WebRTC Leak Test takes 10 seconds.
- ✅ Understand that IP is only one part of tracking. Cookies, logins, and browser fingerprints do more of the work than most people realise.
- ✅ For commercial privacy, prefer full-tunnel VPN clients from reputable operators over browser-extension "VPNs," which often leak.
FAQ
Can a website find my exact home address from my IP?
No. IP geolocation is accurate to the city or metro at best, and for residential IPs it is often off by tens of kilometres. Only your ISP can map an IP to a physical address, and they only disclose that under legal process.
Does an IP address identify a person?
Not by itself. A residential IP typically identifies a household. Mobile IPs may be shared by hundreds of users via CGNAT. Under GDPR an IP is treated as personal data because it can be linked to a person with extra context, but on its own it is closer to a neighbourhood than a name.
What is an ASN?
An Autonomous System Number identifies the network operator that owns an IP range. For consumers it's your ISP. For cloud IPs it's the cloud provider. Anti-fraud systems read the ASN to detect traffic coming from data centres or known VPN providers.
Do IPv4 and IPv6 leak the same things?
IPv6 can leak more. Older IPv6 addresses embedded the MAC of the network card, giving a stable per-device identifier. Modern OSes rotate this via privacy extensions, but the /64 prefix is still geographically precise, and self-hosted services sometimes still expose the MAC-derived form.
Does a VPN hide my IP completely?
It replaces your public IP with the VPN's IP. It doesn't hide the existence of an IP, the contents of DNS queries (unless the VPN has its own resolver), WebRTC candidates (unless the VPN blocks non-tunneled UDP), or IPv6 (unless the VPN tunnels IPv6).
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